Geology, &c. of the Connecticut. 33 
these slates has been long since given to the public by Prof. 
Silliman in President Dwight’s Statistical account ot New- 
= page 11. Their strata run N. E. and 5. W. and 
dip to the S. E. The angle of depression below the 
horizon: nan exceeding 30° or 40°. 
nd specimens of this primitive greenstone and of the 
secondary greenstone from East or West Rock be exhibited 
toa ree te who had never visited the localities, and 
hesitate, I think, to pronounce that from East and 
West Rock to be primitive, and the other to be secondary ; 
and for the reason, that he would find the secondary green- 
stone to be much the coarsest and most crystalline. The 
primitive greenstone of this locality is finely granular, and 
agrees, in this respect, with Jameson’ s description of transi- 
tion greenstone. 1 ; 
1 of Science, Vol. 2. p. 165.) that the Verd Antique of Mil- 
sibly Sig one eat ane this 
: a oes on - fr 
this marble and the saa may Sela tothe meee 
The finely granular texture of transition greenstone, is how- 
ever, by no means a distinctive character: since both the 
oe and floetz greenstones are described as possessing 
- The range of primitive greenstone in 1 Northfield and Gill, 
of secondary emma and extends i into Vernon. Its char- 
ty. ely eau 
Milford. Some of it hov pproacl the: 
ture of sienite: b t still the hornblend lominates. Itisof- 
ten " es and ofte Ce Mne mee eS ee ensto! one 
pe Near the’ seater point I observed a pharm dike of 
limpid quartz several rods long and one foot wide, traversing 
this rock, having, a part of the distance, saalbandes of ffelspar. 
The primitive greenstone occurring in Whately is some- 
what different in its characters from that in Milford. It is 
e irits texture, being some- 
times rendered almost st porphyrit ic by the imbedded peices 
of compact felspar, and sometimes being little else than pure 
hornblende. It is not extensive and alternates in one in- 
stance with sienite, the locality of which has heen pointed 
out in ig a ~agy the latter ie 
Vou, VI 
